The hot, hot summer of Tajimi has arrived, and Himeno, Mika, Naoko, and Touko have a blast in the river trying to catch eel!
Then suddenly a kappa appears before them and takes them down to Ryūgū-jō.
Inside Ryūgū-jō, a certain person in the form of their high school self is awaiting them...
It's the Kappa-san.
!إنّه كابّا-سان
Der Kappa!
¡Ahí está el kappa!
¡Ahí está el kappa!
Ah, le kappa !
Oh, c'è Kappa-san.
É o Kappa-san.